Air compressor



April 29, 1930. H, H, VAUGHAN ET AL 1,756,712

AIR COMPRESSOR Filed Feb. 25, 1929 HENRy H. Vac/anal( mvo WILL/fm G. Cum/wma.

HTTURNEy.

Patented Apr. 29, 1930- UNITEWSTATES PATENT oFr-'I'CE- HENRY H. VAUGHAN, OI' MONTREAL, QUEBEC, AND WILLIAM G. CUMMING, OF WEBT- MOUNT, QUEBEC, CANADA, ASSIGNOBS T CUMMIN' G PUMP CORPORATION LIMITED, OF MONTREAL, CANADA, A. CORPORATION OF CANADA AIB COMPRESSOR Application mea February as, 192s. serial No. 342,598.

This invention relates to air compressors of a ortable type and particularly to a form suita le for iniating the tires of automobiles and the like.

The object of the invention is to provide a small, compact, eicient and inexpensive air compressor of novel design and operation,

which may be convenientl ,coupled temporarily to the main shaft o a motor, to produce a supply of air under pressure to meet the requlrements for inflating pneumatlc tires.

A further object is to provide an air compressor having a short stroke and a relatively large capacity, in which ilexlble dlscs replace a reciprocating iston. A further object is to providean air compressor in which a flexible diaphragm replaces the usual 'piston packing, and provides a permanent and air tight seal to the pumping chamber.

Further objects will be set forth hereinafter.

The invention consists in a casing divided into two chambers by a flexible diaphragm,

in one of which a pump of the disc type o perates, while the drive mechanism occupies the other chamber.

Reference is made to the accompanymg drawings in which Figure 1 is a vertical cross section. Figure 2 is a vertical cross section at right angles to Figure 1.

Figure 3 shows the cushion on recipro- 5 eating end of the pump. The device comprises two chambers, a

pump chamber 1 and a drive chamber'2, separated by the flexible diaphragm 8.

4,0 The diaphragm 8 is secured between the yflanges 10 and 2O of the chambers 1 and 2, by a series of bolts 81.

The chamber 2 which is dome shaped, has opposite sides 22 flattened, in which are mounted bearings 23 for the drive shaft 6,

which operates the compressor.

Mounted on the drive shaft 6 is the eccentric block 62, on .which the connecting rod 7 is journalled.

A plunger 4 secured to the center. of the diaphragm 8, has lugs 41 pivoted on the pin Y 70 to the connectin rod 7.

' Some form of guide is required to hold the plunger 4 in axial position during its reciprocation. That shown in the drawing consists of a link 9 mounted pivotally on the pin 70 at one end and at the other end pivoted on a pin 9() in the chamber wall 2.

' A flanged stem 30 on which the disc 3 is mounted, has a collar 32, and passes through the center of a grooved washer 31, the diaphragm 8 and the head of the plunger 4, and is held firmly in position by the nut 33. The resilient diaphragm 8, secured in this manner at its center and at its outer edge, has a substantially U shaped radial section, the sides of which bear respectively on the periphery of the plunger 4 and the inside of the Wall of the chamber 2, and which vary in extent with the reciprocation of the plunger 4.

The chamber 1 has a concentric cap 11 in which a similar flanged stem 50 on which the disc 5 is mounted, is slidingly held by the nut 53 and the coil spring` 51. The discs 3 and 5 which have flexible edges are preferably of a'resilient material such as rubber. An inlet 13 with a .valve 14 at the center point of contact of the discs 3 and 5, can pass through either of the stems 30 or 50. The inlet 13 is shown in the drawings in dotted lines in the stem 30 and disc 3. The outlet to the pump chamber 1 is shown at 12. It consists in a passageway through the stem 50 'with ports 54 in the collar 52. The cap 11 is threaded to receive a nipple 56 of a exible tube 55, which leads to the tire valve.

'Ihe drive shaft 6 has a hand grip 60, and has a suitable coupling at its other end, whereby it can be coupled to the main shaft of the vehicle motor.

The operation of the device is as follows When the drive shaft is coupled to the motor shaft, and the engine is otherwise idling, the rotation of the drive shaft and its eccentric block reciprocates the plunger through the connecting rod, and with it, the disc mounted thereon.

When the discs are in the position shown. in Figure 1, at the limit of the plunger stroke1 their faces are in complete contact. As 'the plunger recedes'and draws the stem of the lower disc downwards, the faces of the discs are separated from each other about their central areas, while towards their edges they remain in contact, forminga cavity under vacuum. `The suction due to the vacuum opens the inlet valve at the center of the discface, and admits a charge of air to fill the cavity. When theplunger begins its outward stroke, the air in the cavity comes under pressure and closes the inlet valve.

ready means of adjusting the pressure of the faces of the discs to each other, when in the contacting position, and also provides a cushion to the stroke of the plunger, and relieves the discs from Shocks. The diaphragm provides a fiexible wall and seal to the pump chamber and eliminates the use of a packing between the plunger and its entrance to the pump chamber. On the reciprocation of the plunger the U shaped section of the diaphragm rolls upon itself on the periphery of the plunger and the wall of the chamber.

The pressure of the compressed air within the pump chamber, acting on the diaphragm, operates to force its central portion and with it the plunger and its attached members, towards the drive shaft, and thus relieves the straink on the mechanism during the suction stroke.

The pump element may be provided with a cushion su port not only between the stationary mem er and the chamber wall, but also between the reciprocating member and its sup ort, or the latter alone.

In i re 3 the cushion support is shown mounte between the reciprocating member of thev pump and the plunger on which it is supported.

We claim- 1. In an air compressor, a a pumi comprisintwo discs mounted therein, a exible diap ragm forming a portion of the chamber Wall, the reciprocating element of the pump carrying one of the discs secured to the diaphragm, and means to reciprocate such elemen 2. In an air com ressor, a pump chamber, a pump comprising eXible-edged discs mounted therein, a flexible diaphragm forminga portion of the chamber wall, one of the discs secured to the diaphragm, and means to reciprocate that disc.

3. In an air compressor, a pump chamber,

pump chamber,

a flexible diaphragm forming a ortion of its wall, a plungersccured to the iaphragm, means to reci rocate the plunger, a pump mounted in t e chamber, comprising two discs with exible edges, one of which is secured to the plunger,vand the other is sup-V ported on the chamber wall.

4. In an air compressor, a cup shaped pump chamber, a flexible diaphragm secured to the edge of the ou a flexible ed ed disc mounted centrally in t e bottom of t e cup, a similar disc mounted centrally on the diaphragm,

adapted to contact with the rst disc, and means to reciprocate the second disc.

5. In an air compressor, a cup shaped pump chamber, a flexible diaphragm secured to the edge of the cup, a pump Within the chamber, comprising a flexible edged disc mounted centrally in the bottom of the cup, and al similar disc mounted centrally on the diaphragm, the lfaces of the discs adapted -to contact, means to reciprocate the second disc, a valved inlet to the central point of contact of the faces, and an outlet from'the chamber.

6. In an air compressor, a cup shaped pump chamber, an outlet thereto, a drive chamber having transverse bearings journalling av drive shaft, a fiexible diaphragm forming the wall between the chambers, a pump within the pump chamber, comprising a flexible edged disc mounted centrally in the bottom of the cup, and a similar disc mounted centrally on the diaphragm the faces of the discs adapted to contact, a valved inlet to the central point of contact of the faces, and means to reciprocate the disc on the diaphragm from the drive shaft.

7. In an air compressor, a cup shaped pump chamber, an outlet thereto, a drive chamber,

having transverse bearings journalling a drive shaft, a eXible diaphragm forming the wall between the chambers, a pump within the pump chamber, comprising a flexible edged disc mounted centrally in the bottom of the cup, and a similar disc mounted centrally on the diaphragm, the faces of the discs adapted to contact, a valved inlet to the central point of contact of the faces, a plunger secured to the center of the diaphragm and the disc thereon, means to guide the plun er, and means to reciprocate the plunger rom the driving shaft.

8. In an air compressor, a'cup shaped pump chamber having a sleeve extending outwardly ing the wall between the chambers, having a U-shaped radial section, a pump within the pum chamber a plunger secured to the center o the da hragm and the reciprocating member of te pump, means to reciprocate the plunger, the diaphragm adapted to roll on itself over the periphery of the plunger and the wall of the chamber. l

10. In an air compressor, a cup shaped m pump chamber having a threaded sleeve eX- tending from the center of its bottom, a'lexible diaphragm secured to the edge of the n cup, a flexible edged disc mounted on a stem, seated in the sleeve on an adjustable spring seat, an outlet passa e throu h the stem, a

similar disc mount central y on the diaphragm by a stem, the faces of the discs adapted to contact, means to reciprocate the second disc, and an inlet through its stem having a valve at the center point of contact of the discs faces.

11. In an air compressor, a pump chamber, a pump element mounted therein, and a cushion support between .the pumpk element and the chamber wall and means to adjust the tension of the cushion support.

12. In a device of the class specified, a pump chamber, a pump mounted therein, reciprocatin means for actuating 'the pump and a yiel -ng'connection between the pump and the pump chamber.

13. In a device of the class .s ied, a pump chamber, a pump mounted t erein, reciprocating means for actuating the pump and an adjustable yielding, connection between the pump and the reciprocating means.

HENRY H. VAUGHAN. WILLIAM G. CUMMING.

enA 

